EJB34045 - 45 Amp Circuit Breaker

EJB34045 - 45 Amp Circuit Breaker

When your dependable circuit protection is a priority, the Square D EJB34045 is built to get the job done. This 45 Amp, 3-pole E-Frame circuit breaker is engineered for use in compatible Square D NF panelboards, helping protect electrical systems from overloads and short circuits before they can cause costly damage or downtime. Its thermal-magnetic trip mechanism reacts to both prolonged overcurrent conditions and sudden faults, while the built-in trip indicator lets maintenance personnel quickly identify a tripped breaker.

Key Features and Benefits

• 45 Amp current rating
• Three-pole configuration for three-phase power distribution
• Bolt-on mounting for compatible Square D NF panelboards
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator helps speed troubleshooting
• Rated for up to 480Y/277V AC systems
• Interrupting capacity up to 100 kA at applicable voltages
• HACR and HID rated
• Compatible with both copper and aluminum conductors
• Calibrated for operation at 40°C (104°F)

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34045
  
• Frame Series: E-Frame (125A Frame EDB/EGB/EJB)
  
• Current Rating: 45 Amps
  
• Poles: 3
  
• Maximum Voltage: 480Y/277V AC
  
• Mounting Style: Bolt-On
  
• Trip Technology: Thermal-Magnetic
  
• Protection: Overload and Short Circuit
  
• Trip Rating: 1800 A
  
• Holding Current: 630 A
  
• Interrupting Rating:
  • 100 kA @ 120V AC
  • 100 kA @ 120/240V AC
  • 100 kA @ 240V AC
  • 65 kA @ 277V AC
  • 65 kA @ 480Y/277V AC
• Wire Size:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Terminal Type: Aluminum lugs
  
• Compatible Panelboards: Square D NF
  
• Dimensions:
  • Height: 5.66 in. H
  • Width: 2.94 in. W
  • Depth: 4.05 in. D
• Weight: Approximately 4 lbs.
  

Material Compliance and Certifications

The Square D EJB34045 is cULus Listed, HACR rated, HID rated, and TAA compliant. It is calibrated for operation in ambient temperatures up to 40°C (104°F) and is manufactured to meet recognized industry standards for safety and performance. Installation should always follow applicable electrical codes and manufacturer recommendations.

Where It Works Best

The EJB34045 is commonly used in applications such as:

• Square D NF panelboards
• Commercial office buildings
• Manufacturing facilities
• Schools and universities
• Healthcare facilities
• Warehouses
• Retail buildings
• HVAC equipment
• HID lighting systems
• Electrical system upgrades and replacement projects